硬化病菌の生毛部および気門からの侵入について

概要

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In the case of hyphal penetration of muscardine fungi through the body-wall of silkworm larva, the hair-socket of the skin and the side-wall of the tracheal manifold were considered to be the weak points against the hyphal invasion. The results were summarized as follows;1) In the 5th instar larvae, the connecting part of the seta and its formative cell of the skin had a thin cuticular layer, and the space between the base of the seta and the papilla of the cuticle was estimated 2-3μm in width. In this particular part of the skin, the histopathological changes indicating the preinvasional and intensive fungus penetration were frequently observed as well as the defense responses against the fungus invasions. And such phenomena were less frequently seen in the other parts of the skin.2) The side-wall epithelium of tracheal manifold in the stigma of larva was covered by a thin cuticular layer, and placed under the hiatus and the lamella pores of the sieve plates. In this part, the histopathological changes to indicate the intensive fungus penetration were observed in the larvae treated at the lethal inoculation; but in the case of nonlethal inoculation with the weak pathogenic fungi, the visible defence responses of larvae were observed.3) After the death of the host larvae, the hyphal appearings from both the seta-setting points and stigmata took place earlier than the other parts of the skin.
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